28.Z2.F04-1003 KEB
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The KEB 28.Z2.F04-1003 is a three phase motor choke from the Z2 series, offering a rated current of 370 Amps and an inductance of 0.033 mH. This component features a conductor cross-section of 120 mm² and a frequency rating of 600 Hz. It has a protection rating of IP00 and weighs 58.5 kilograms.
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Product Description:
The 28.Z2.F04-1003 is a three-phase line reactor produced by KEB within the Z2 Three Phase Motor Chokes series. Installed between an inverter and an AC motor, the component attenuates high-frequency current peaks and smooths voltage waveforms, protecting drive electronics and motor windings in automated equipment. By adding impedance to each phase, the choke reduces electromagnetic interference, limits differential current spikes, and helps extend insulation life in continuous-duty production lines. The three-phase design filters the inverter output before electrical power reaches the connected motor.
The reactor is designed to carry a continuous current of 370 A without exceeding its copper or core limits. Its phase inductance is 0.033 mH, providing impedance that filters switching edges at frequencies up to 600 Hz. The terminals accommodate conductors with a cross-sectional area of 120 mm², helping keep current density low and limit temperature rise. Copper path resistance is only 0.58 mΩ, which minimizes resistive losses at full load. The open-frame construction has an IP00 rating and requires installation inside a ventilated control cabinet. This enclosure arrangement prevents accidental contact with exposed parts while allowing air to move across the laminated core.
The laminated assembly has a mass of 58.5 kg, which contributes to its thermal capacity during operation. At a harmonic spectrum equivalent to 1,600 Hz, the device dissipates 935 W, and this heat must be removed through forced airflow or cabinet cooling. The M12 bolt terminals require a tightening torque of 40 Nm to maintain secure, low-resistance electrical connections. An embedded normally closed thermal switch opens at 155 °C to signal an overtemperature condition before insulation damage occurs. The reactor measures 450 mm wide, 465 mm deep, and 325 mm high, so the cabinet must provide adequate installation space around the open frame. Its active coil height is 180 mm, and sufficient clearance should be maintained to support unobstructed cooling airflow.
